shmoo Share definition Flag a squash shaped critter that tastes like chicken. Li'l Abner discovered Shmoos when he ventured into the forbidden Valley of the Shmoon, against the frantic protestations of Ol' Man Mose. shmoo by tomoko July 31, 2003 0 0 Get merch Get the shmoo mug. Buy Now — $32.95 See more merch